Asphalt blend compositions containing used motor oil and asphalt pavement compositions containing said asphalt blend compositions

ABSTRACT

An asphalt blend composition containing an asphalt component and a bottoms fraction from a used motor vaporization process of the above process, and a pavement composition comprising aggregate and the asphalt blend composition. The process comprises directly contacting used lubricating oil with a heated vapor, e.g., steam, under conditions which at least partially decompose the organo-metallic component and provide a desired volume of pumpable bottoms containing organo-metallic compound decomposition products and an overhead comprising gases and distillatable hydrocarbons, with no substantial carryover of metals into the overhead. The process may be carried out under conditions which minimize decomposition of high molecular weight additives such as VI improvers.

CROSS REFERENCE TO RELATED APPLICATION

This application is a Division of utility application U.S. Ser. No.09/026,367, Process for Recovering Lube Oil Base Stocks from Used MotorOil Formulations, Asphalt Blend Compositions Containing Used Motor OilBottoms from Said Process, and Asphalt Pavement Compositions ContainingSaid Asphalt Blend Compositions, filed on Feb. 19, 1998, now U.S. Pat.No. 6,068,759, granted May 30, 2000, which is incorporated by reference.

BACKGROUND OF THE INVENTION

This invention relates to a process for recovering lube oil base stocksfrom used motor oil formulations, asphalt blend compositions containingUsed Motor Oil (UMO) bottoms from the process, and asphalt pavementcompositions containing the asphalt blend compositions.

Automotive lubricating oils are usually formulated from paraffin basedpetroleum distillate oils or from synthetic base lubricating oils.Lubricating oils are combined with additives such as soaps, extremepressure (E.P.) agents, viscosity index (V.I.) improvers, antifoamants,rust inhibitors, antiwear agents, antioxidants, and polymericdispersants to produce an engine lubricating oil of SAE 5 to SAE 60viscosity.

After use, this oil is collected from truck and bus fleets, automobileservice stations, and municipal recycling centers for reclaiming. Thiscollected oil contains organo-metallic additives such as zincdialkylthiophosphate from the original lubricating oil formulation,sludge formed in the engine, and water. The used oil may also containcontaminants such as waste grease, brake fluid, transmission oil,transformer oil, railroad lubricant, crude oil, antifreeze, dry cleaningfluid, degreasing solvents such as trichloroethylene, edible fats andoils, mineral acids, soot, earth and waste of unknown origin.

Our process, disclosed in U.S. Ser. No. 09/026,367, disclosed a newprocess for reprocessing UMO. This invention is directed to asphaltblends and asphalt pavements comprising the residue from our UMOprocess.

BRIEF SUMMARY OF THE INVENTION

In another aspect, the invention relates to a novel asphalt blendcomposition containing, an asphalt component and the used motor oilbottoms product prepared by the process of the present invention, withor without modification additives such as polymers, chemical gellants,and antioxidants and to paving compositions containing such modifiedasphalts. Generally, the asphalt blend compositions comprise (a) about0.1 to about 20 wt. %, preferably about 0.5 wt. % to about 15 wt. % ofused motor oil bottoms prepared by the process of the present invention,(b) about 0 to about 20 wt. %, preferably about 0 to about 10 wt. % of apolymer modifier, (c) about 0 to about 7 wt. %, preferably about 0 toabout 5 wt. % of a chemical gellant and (d) at least about 80 wt. %,e.g., about 80 wt. % to about 99 wt. %, say, 90 wt. %, of an asphaltcomponent obtained from conventional vacuum distillation, atmosphericdistillation, solvent refining, e.g., solvent deasphalting bottoms, ornaturally occurring mineral sources, e.g., Trinidad Lake asphalt. Allpercents herein are by weight of total composition. Asphalt pavingcompositions of such blend can exhibit a distinct improvement in lowtemperature properties, in their resistance to thermal cracking andfatigue as defined by the use of the new Superpave Performance Graded(PG) Asphalt Binder Specifications: AASHTO MP1.

In yet another aspect, the present invention relates to a pavementcomposition comprising aggregate and from about 1-10 wt. % of an asphaltblend containing at least about 80 wt. % of asphalt and from about0.5-15 wt. % of the bottoms fraction of prepared by the process of thepresent invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawing is a schematic flow diagram illustrating a preferredembodiment of the process of the present invention for reclaiming usedlubricating oil.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Process

Further features and advantages of the present invention will becomeapparent to those skilled in the art from the description of thepreferred embodiment herein set forth.

The used lubricating oil that can be treated in accordance with thepresent invention includes used crankcase oil from motor vehicles suchas, for example, cars, trucks and railroad locomotives, as well asautomatic transmission fluids and other functional fluids in which themajor constituent is an oil of lubricating viscosity. Unavoidably, usedlubricating oil often contains amounts of water and other hydrocarbonliquids, e.g., light hydrocarbons having a boiling point of less than600° F., e.g., less than 210° F. The present invention is especiallyadvantageous inasmuch as no preseparation of water and lighthydrocarbons liquids is necessary.

Included within the group of used lubricating oils suitable fortreatment herein are used motor oils having mineral lubricating oilssuch as liquid petroleum oils and solvent-treated or acid-treatedmineral lubricating oils of the paraffinic, naphthenic or mixedparaffinic-naphthenic types as the base oil. Oils of lubricatingviscosity derived from coal or shale oil can also be included as thebase oil of such used motor oils. This group also includes used motoroils having as the base oil synthetic lubricating oils includinghydrocarbon oils and halosubstituted hydrocarbon oils such aspolymerized and interpolymerized olefins (e.g., polybutylenes,polypropylenes, propyleneisobutylene copolymers, chlorinatedpolybutylenes, etc.); poly(1-hexenes), poly(1-octenes), poly(1-decenes),etc. and mixtures thereof; alkylbenzenes (e.g., dodecylbenzenes,tetradecylbenzenes, dinonylbenzenes, di(2-ethylhexyl)benzenes, etc.):polyphenyls (e.g., biphenyls, terphenyls, alkylated polyphenyls, etc.);alkylated diphenyl ethers and alkylated diphenyl sulfides and thederivatives, analogs and homologs thereof and the like.

Alkylene oxide polymers and interpolymers and derivatives thereof wherethe terminal hydroxyl groups have been modified by esterification,etherification, etc. constitute another class of known syntheticlubricating oils that can be the base oil of the used lubricating oilstreated in the present invention. These are exemplified by the oilsprepared through polymerization of ethylene oxide or propylene oxide,the alkyl and aryl ethers of these polyoxyalkylene polymers (e.g.,methylpolyisopropylene glycol ether having an average molecular weightof 1000, diethyl ether of polyethylene glycol having a molecular weightof 500-1000, diethyl ether of polypropylene glycol having an averagemolecular weight of 1000-1500, etc.) or mono- and polycarboxylic estersthereof, for example, the acetic acid esters, mixed C₃-C₈ fatty acidesters, or the C₁₃ Oxo acid diester of tetraethylene glycol.

Another suitable class of synthetic lubricating oils that can be thebase oil of the used lubricating oils treated by the present inventioncomprises the esters of dicarboxylic acids (e.g., phthalic acid,succinic acid, alkyl succinic acids and alkenyl succinic acids, maleicacid, azelaic acid, suberic acid, sebacic acid, fumaric acid, adipicacid, linoleic acid dimer, malonic acid, alkyl malonic acids, alkenylmalonic acids, etc.) with a variety of alcohols (e.g., butyl alcohol,hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol,diethylene glycol monoether, propylene glycol, etc.). Specific examplesof these esters include dibutyladipate, di(2-ethylhexyl) sebacate,di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecylazelate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, the2-ethylhexyl diester of linoleic acid dimer, the complex ester formed byreacting one mole of sebacic acid with two moles of tetraethylene glycoland two moles of 2-ethylhexanoic acid, and the like.

Esters useful as synthetic oils that the used lubricating oils to betreated can be derived from include C₅-C₁₂ monocarboxylic acids andpolyols and polyol ethers such as neopentyl glycol, trimethylol propane,pentaerythritol, dipentaerythritol, tripentaerythritol, etc.

Silicon-based oils such as the polyalkyl-, polyaryl-, polyalkoxy-, orpolyaryloxy-siloxane oils and silicate oils comprise another class ofsynthetic oils that can be the base oil of the used lubricating oilsthat can be treated (e.g., tetraethyl silicate, tetraisopropyl silicate,tetra-(2-ethylhexyl) silicate, tetra-(4-methyl-2-ethylhexyl) silicate,tetra-(p-tert-butylphenyl)silicate,hexa-(4-methyl-2-pentoxy)-disiloxane, poly(methyl)siloxanes,poly(methylphenyl)siloxanes, etc.). Other synthetic oils include liquidesters of phosphorus-containing acids (e.g., tricresyl phosphate,trioctyl phosphate, diethyl ester of decylphosphonic acid, etc.),polymeric tetrahydrofurans and the like.

The term “lubricating oil” when used herein does not limit the utilityof the oil to lubricating, but is merely a description of a propertythereof, namely, that the oil is of lubricating viscosity.

The foregoing used lubricating oils usually contain one or more ofvarious additives such as, for example, oxidation inhibitors (i.e.,barium, calcium and zinc alkyl thiophosphates, di-t-butyl-p-cresol,etc.), anti-wear agents (i.e., organic lead compounds such as leaddiorganophophorodithioates, zinc dialkyldithiophosphates, etc.),dispersants, (i.e., calcium and barium sulfonates and phenoxides, etc.),rust inhibitors (i.e., calcium and sodium sulfonates, etc.), viscosityindex improvers, (i.e., polyisobutylenes, polyalkylstyrene, etc.), anddetergents (i.e., calcium and barium salts of alkyl and benzene sulfonicacids and ashless type detergents such as alkyl-substitutedsuccinimides, etc.). Additionally, the used lubricating oils treated inaccordance with the present invention usually contain variouscontaminants resulting from incomplete fuel combustion as well as waterand gasoline. The process of the present invention is particularlysuitable for removing or reducing to acceptable levels (e.g., to permitsubsequent hydrogenation without poisoning the hydrogenation catalyst)the above-indicated nitrogen-containing materials and metal-containingmaterials.

The process of the present invention is preferably carried out in avessel stirred by the action of the impinging velocity of the heatedvapor being introduced therein. The vessel can be entirely conventionalin design and construction. The size, design and construction of suchvessel is dependent upon the volume of used lubricating oil to beprocessed. In one embodiment, steam enters at the bottom of the vessel,vapor exits at the top of the vessel, and the residue is drained fromthe bottom of the vessel. No internal components are necessary.

Asphalt Blend Compositions Containing Used Motor Oil Bottoms

Asphalt Component

Any suitable asphalt or asphalt cement may be employed for producing themodified asphalt blend compositions of the invention. For example,industrial asphalts used for coatings, sealants, roofing materials,adhesives, and other applications may be used. Paving grade asphaltcompositions, however, are employed in the preferred embodiment of theinvention. Asphalt compositions may be derived, as indicated, from anywell known bituminous or asphaltic substance obtained from naturalsources or derived from a number of sources such as petroleum, shaleoil, coal tar, and the like, as well as mixtures of two or more of suchmaterials. Typical of such asphalts are the straight run asphaltsderived from the atmospheric, steam and/or vacuum distillation of crudeoils, or those asphalts derived from solvent precipitation treatments ofraw lubricating oils and their fractions. Also included are the thermalor “cracked” asphalts which are separated as cracker bottom residuesfrom refinery cracking operations and the asphalts produced asbyproducts in hydrorefining operations. A preferred asphalt is thevacuum tower bottoms that is produced during the refining of syntheticor petroleum crude oils. As indicated, for paving applications, anysuitable paving grade asphalt may be employed for the compositions ofthe invention. Such paving grade asphalt compositions are often referredto as viscosity, penetration graded, or performance graded (PG) asphaltshaving penetrations up to 400 as measured by ASTM method D5. Preferredasphalts are the performance graded asphalts such as PG 46-40, PG 46-34,PG 46-28, PG 52-40, PG 52-34, PG 52-28, PG 52-22, PG 58-40, PG 58-34, PG58-28, PG 58-22, PG 64-40, PG 64-34, PG 64-28, PG 64-22, PG 70-40, PG70-34, PG 70-28, PG 70-22, PG 76-40, PG 76-34, PG 76-28, PG 76-22, PG82-34, PG 82-28, or PG 82-22. The PG in the title refers to PerformanceGraded, the first numeric designation refers to the binder's hightemperature rutting or deformation resistance temperature range limit,and the last numeric designation refers to the binder's low temperaturethermal cracking resistance temperature limit. Complete specificationrequirements are outlined in specifications under AASHTO MP-1-93Performance Graded Asphalt Binder Specification. AASHTO is thedesignation for the American Association of State and HighwayTransportation Officials.

The asphalt blend compositions of asphalt component and the used motoroil bottoms of the present invention also exhibit improved lowtemperature performance properties without excessive sacrifice of hightemperature PG grade performance, e.g., rutting resistance.

Polymer Modifiers:

The polymers used for the present asphalt blends are well-known to thoseskilled in the art and comprise: Styrene Butadiene (SB) diblockpolymers, Styrene-Butadiene-Styrene (SBS) triblock polymers which may beeither linear or radial, styrene-isoprene-styrene (SIS) diblockedpolymers, hydrotreated SBS, Styrene Ethylene Butadiene Styrene polymers(SEBS), Styrene Butadiene Rubber (SBR), polyacrylamide, e.g., thosedescribed in U.S. Pat. No. 4,393,155 to Garrett, Glycidyl-containingethylene copolymers in U.S. Pat. No. 5,331,028, or Crumb Rubbers.

Gellants:

Similarly, the gellants which can be added to the present asphalt blendsare not narrowly critical and can include: chemical gellants such asmetallic soaps formed by the neutralization of fatty acids and/or rosinacids; organoclays, e.g., bentonites, kaolin clays, etc.; hydrogenatedcastor oils; oligomers; siloxanes; or others well-known to those skilledin the art or included in the patent or other literature.

Antioxidants:

Though not narrowly critical, preferred antioxidants are an oxidationinhibiting or stabilizing amount of a composition selected from metalhydrocarbyl dithiophosphates, and mixtures thereof, and a compositionselected from antioxidant butylated phenols, and mixtures thereof, in aspecified ratio to each other, as described more fully hereinafter.Preferably, the components are added to the oxidized blend of asphaltand fluxing component so that the resulting product comprises from about0.1 wt. % to about 5.0 wt. % of a composition selected from metalhydrocarbyldithiophosphates, and mixtures thereof, and from about 0.1wt. % to about 5.0 wt. % of a composition selected from antioxidantbutylated phenols, and mixtures thereof, in a specified ratio to eachother, as described more fully hereinafter. Most preferably, metalhydrocarbyl dithiophosphate component employed is a mixture of suchdithiophosphates, and the metal hydrocarbyl dithiophosphate component issupplied in an amount of from about 0.1 wt. % to about 2.0 wt. %. Theantioxidant butylated phenol is preferably supplied in a range of fromabout 0.1 wt. % to about 2.0 wt. %.

Hydrocarbon Solvents

The hydrocarbon solvents can be any which are capable of reducing theviscosity of the asphalt blend composition. Preferred solvents include:mineral spirits, naphthas, kerosenes, and fuel oils.

Emulsifiers

The emulsifiers include anionic or cationic or nonionic emulsifiers.Those particularly preferred are those described in U.S. Pat. No.4,393,155 to Garrett, the contents of which are incorporated herein byreference.

Process Description

Referring to the drawing, raw, used lubricating oil containing 1-10 wt.% organo-metallic compounds, 0-10 wt. % water, 0-5 wt. % lighthydrocarbons having a boiling point below 300° F., and 0-5 wt. %viscosity index improvers, which has not been pretreated to remove waterand lower boiling point liquids is passed through line 10 to pluralvessels 20, 30, and 40 which are controlled by valves 25, 35, and 45,respectively. Each vessel is capable of holding about 10 to 1000gallons, preferably 100 to 500 gallons of used lubricating oil. Steamsuperheated to a temperature of 700 to 1600° F., is introduced into thevessels through lines 27, 37, and 47, respectively, at a rate of 1 to 3pounds/pound of charge, in order to heat the oil to a temperature of650° F. by direct contact. The required contact time for the oil isdependent on the concentration of organo-metallic compounds in the usedoil, the desired extent of decomposition of the organo-metalliccompounds and the desired volume reduction and degree of lift. Steamrate is adjusted to avoid entrainment of organo-metallic compounds intothe overhead fraction which contains water, light hydrocarbons, anddistillatable oil. The overhead fraction is passed through lines 28, 38,and 48, into line 49 which passes into a vacuum distillation column 50wherein lighter hydrocarbons (suited to use as fuel gas afterseparation) and water are taken off as overhead through line 55. Thedistillate oil may be recovered as a single product but is typicallyfractionated to produce a number of distillate fractions which have theboiling range of the final lubricating oil product desired. Differentfractions of lubricating oil are taken off the column at 51, 52, and 53,and collected. The initial boiling point of the distillate fraction is70° F., and the end point is 1100° F. The collected distillate may befurther treated by catalytic hydrogenation or clay treatment (not shown)to reduce sulfur content, improve color, saturate olefins and therebyincrease stability and reduce gum forming compounds. The vacuum bottomsare taken off at 54 and may be used as fuel oil, asphalt extender,feedstock for delayed coking, feedstock for partial oxidation or agasifier or for cement kiln fuel where the metal would remain in theproduct cement. The bottoms fraction from the vessels are removed fromlines 29, 39, and 49, respectively and are directed through line 60 foraddition to fuel oil or, alternatively, directed through line 70 formixing with asphalt in asphalt mixing means 80, the asphalt beingdirected through line 90.

The above can be carried out using 1 or more vessels. Where a singlevessel is used, there is an interruption of overhead to the vacuumdistillation column during heating up of the used motor oil, and duringthe removal of the is bottoms fraction. In a preferred embodiment, useof the column is optimized by having one or more additional vesselsoperated in parallel so as to provide a constant or near constant sourceof overhead to the column.

By way of further illustration of the process of the present invention,reference may be made to the following example. Unless otherwiseindicated, all parts and percentages are by weight.

EXAMPLE 1

Batch Process

2002 g of a raw used motor oil containing emulsified water were chargedto a 30 inch tall batch vessel of 4 inch nominal diameter (externallyheated by a temperature controlled heat tape to cancel heat losses).Superheated steam (1030-1050° F.) was injected through a ball valvedirectly into the bottom of the liquid used motor oil bath at an averagesteam flow of 1109 grams per hour. The test was run for 3.08 hours to afinal temperature of 600° F., the overhead vapors (oil and water) werecondensed in two series product condensers, and the oil productsanalyzed. Residual pot materials were also removed and analyzed aftercooling. Results are set out in Table 1 below.

TABLE 1 Composite Products: Overhead Bottoms Collected, g 1483 556 ° API28.1 19.0 Elemental Analyses 74.1 27.8 (wt. %) Raw Yield Mg <.01 0.19 P.003 0.38 S 0.13 0.90 Cl 0.016 0.008 Ca 0.001 0.48 Fe 0.003 0.08 Zn0.001 0.51 Pb — 0.03

The results indicated that oil was successfully separated from additivemetals, i.e., essentially no additive metal carryover occurred. Abottoms yield of about 28 wt. % was obtained and the bottoms were fluid.No process fouling of any type was observed. The bottoms product had noodor at room temperature, and at 400° F. exhibited only a fainthydrocarbon smell similar to hot asphalt, unlike conventionally preparedused motor oil bottoms made by processes using indirect heat exchange,which exhibit a strong burned odor.

EXAMPLE 2

Continuous Process

Used motor oil near ambient temperature was mixed rapidly in an atomizerwith superheated steam to vaporize 70% to 80% of the oil. The residueseparated from the steam-oil vapor mixture and flowed to a residueaccumulator. The steam-oil mixture was cooled first to 225° F., wheremost of the oil and little steam condensed. The heavy oil condensateseparated from the remaining steam-oil vapor in an accumulator. Theremaining steam-oil mixture which was nearly all steam was condensed andcollected in a water condensate accumulator. The process avoidedindirect heat transfer while ensuring that the highest temperature theoil reached was the atomizer outlet temperature. The atomized oil wascooled quickly so residence time at atomizer temperature is short. Steamstripping allowed a lower flash temperature for a given amount of usedmotor oil vaporization compared to atmospheric or even moderatesubatmospheric flash vaporization. An equal weight of steam to usedmotor oil charge is equivalent to moderate vacuum flashing because themolecular weight of steam is 10 to 30 times less than that of used motoroil.

EXAMPLE 3

Asphalt Containing Used Motor Oil Bottoms Additive

Merey crude was distilled to cut temperatures of 825° F. and 850° F. toproduce light and heavy bottom fractions possessing viscosities of 1779and 2738 poise at 140° F. The heavier fraction was cut back with usedmotor oil residue to produce binders with viscosities similar to thelighter cut.

Used motor oil bottoms produced by the batch steam process of thepresent invention using a lift rate of 86% provided a material having anAPI gravity of 13.4, and an elemental analysis (wt. %) of 0.26 Mg, 0.52P, 0.73 Ca, 0.70 Zn, 1.13 S, 0.01 Cl, 0.11 Fe, and 0.04 Pb. Viscositiesmeasured at 60° C. and 100° C. were 7472 and 831 centistokes (cSt),respectively, and were similar to oils possessing a viscosity index of200, suggesting that at least some of the viscosity improvers in theused motor oil remain intact during processing. The bottoms of theinvention contained 10.7 wt. % heptane insolubles (compared to 21.7 wt.% for a commercially available used motor oil bottoms product) whichsuggests less degradation of additives during processing. High pressureliquid chromatography analysis of the used motor oil bottoms showed 52.3wt. % saturates, 10.7 wt. % monoaromatics, 3.2 wt. % diaromatics, 2.5wt. % 3-ring aromatics, 4.2 wt. % 4-ring aromatics, and 16.4 wt. %polars.

Mixing the above used motor oil bottoms with the above Merey crudeproduced an asphalt blend comprising 11 wt. % used motor oil bottoms.The Strategic Highway Research Program (SHRP) properties of the MereyCrude and asphalt blend (11% used motor oil bottoms) are set out belowin Table 2.

TABLE 2 Viscosity SHRP Actual Useful @ Grade Grade Temperature 140° F.(° C.) (° C.) Index (UTI) Merey Crude 1779 PG64-22 64.4-25.2 89.6 MC +11% 1618 PG58-22 63.1-24.2 87.3 UMO bottoms

The data show that adding used motor oil bottoms to neat asphalt haslittle effect (if any, when viscosity differences are considered) on thehigh temperature properties of the blend.

The dynamic shear measurement DSR_(PAV) (which measures an asphalt'sability to withstand fatigue cracking at intermediate temperatures) was23.4° C. for the Merey Crude vacuum bottoms and 20.9° C. for the MereyCrude/UMO blend with every 3° C. drop in passing temperature translatinginto a 6° C. drop in low temperature performance grade. These dataindicate that addition of UMO bottoms can improve fatigue crackingcharacteristics of the Merey Crude asphalt. Accordingly, it is believedthat the used motor oil bottoms produced by the present invention areparticularly useful as additives for asphalts having poor fatiguecracking properties, i.e., the used motor oil bottoms fraction can besubsequently added to asphalt in amounts sufficient to improve fatiguecracking at intermediate temperatures by lowering dynamic shearmeasurement DSR_(PAV) passing temperature of the resulting blend. Thebottoms fraction can be present in an amount sufficient to improvefatigue cracking and/or thermal cracking characteristics by loweringpassing temperatures of dynamic shear rheometer AASHTO-TP5-93 and/orbending beam rheometer AASHTO-TP1-93.

Because the high temperature limit of asphalt binders displays a strongcorrelation to viscosity, it is believed that improved Performance Graderatings can be obtained by raising the viscosity of the blend to, say,1800 or 2000 poise.

What is claimed is:
 1. An asphalt blend composition which comprises anasphalt component and a bottoms fraction obtained from used lubricatingoil formulations containing base oil stock and organo-metallic componentby: i) directly contacting said used lubricating oil with a heated vaporselected from the group consisting of methane, ethane, propane, andsteam, under temperature, contact times, and superficial velocityconditions sufficient to at least partially decompose saidorgano-metallic component and provide a desired volume of pumpablebottoms, and vaporized overhead comprising gases and distillatablehydrocarbons, with no substantial carryover of metals into the overhead;ii) condensing said overhead in at least one stage; iii) recovering atleast part of said overhead as distillate; and iv) recovering saidbottoms fraction containing organo-metallic compound decompositionproducts and wherein said bottoms fraction has no odor at roomtemperature and only a slight hydrocarbon odor at 400 F similar to hotasphalt and is essentially free of a strong burned odor.
 2. Thecomposition of claim 1 wherein said contacting is carried out in avessel charged with said used lubricating oil.
 3. The composition ofclaim 2 wherein said asphalt component is selected from the groupconsisting of vacuum tower bottoms, atmospheric bottoms and solventdeasphalting bottoms.
 4. The composition of claim 3 which comprises atleast about 80 wt. % asphalt component and 0.1-20 wt. % of said bottomsfraction.
 5. The composition of claim 4 which further comprises about 0to about 20 wt. % of a polymer modifier.
 6. The composition of claim 3wherein said asphalt component comprises vacuum tower bottoms.
 7. Thecomposition of claim 3 wherein said asphalt component comprisesatmospheric bottoms.
 8. The composition of claim 3 wherein said asphaltcomponent comprises solvent deasphalting bottoms.
 9. The composition ofclaim 4 wherein said bottoms fraction is present in an amount sufficientto improve fatigue cracking and/or thermal cracking characteristics bylowering passing temperatures of dynamic shear rheometer AASHTO-TP5-93and/or bending beam rheometer AASHTO-TP1-93.
 10. A pavement compositioncomprising aggregate and from about 1-10 wt. % of an asphalt blendcontaining at least about 80 wt. % of asphalt and from about 0.5-15 wt.% of the bottoms fraction of claim 1.